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Actor Charlie Sheen has called in police to investigate his ongoing feud with officials at his daughter's former school after surveillance video footage caught two people attaching a threatening note to a tree outside his ex-wife's home with a steak knife.

The star went public with his nine-year-old's bully battle at her former school in California, launching into an angry online rant.

He raged, "This is a legitimate call to arms. my daughter Sam was bullied out of... school and then called a liar. it's on!

"If you have a rotted (sic) egg, a roll of toilet paper or some dog s--t; I urge u to deliver it with 'extreme prejudice' to their KamPuss (sic) run by trolls and charlatans... make me proud. we will not tolerate this level of abhorrent disrespect..."

School authorities explained the matter was a year old and had been dealt with appropriately, but now Sheen has called in the cops after his ex, Denise Richards, found a nasty note from supporters of the school stabbed into a tree outside her home.

In a tweet on Monday, Sheen called the two people behind the threat "doosh bagz", explaining they had terrorized his ex-wife and their two daughters, Sam and Lola.

He told TMZ.com, "They had the pleasure of discovering a steak knife used to nail a note to the tree."

Sheen revealed the note contained a threat directed at his family and he has contacted police detective, who are attempting to identify them from surveillance tape footage.